Device fob bewiudiitg films



H. B. CUNNINGHAM.

DEVICE FOR REWINDING FILMS.

APPLICATION FILED JAN. 27. 191a.-

1,1 95,785. Patented Aug. 22, 1916.

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HARVY BARRE CUNNINGHAM, OF ST. PAUL, MINNESOTA.

DEVICE FOR REWINDING FILMS.

Specification of Letters Patent.

Patented Aug. 22, 1316.

Application filed January 27, 1913. Serial No. 744,417.

course, necessary to re-wind it so that the pictures thereon will beshown in their proper order when again displayed. In the use of devicescommonly employed in operating rooms for this purpose, the film, owingto breaks or defects therein, is frequently spilled from the unwindingreel and becomes tangled -on the table or'floor of the room. In, thisway, the film is often scratched or otherwise damaged and it alsoendangers the operator and building as a film so exposed is readilyignited by contact with the apparatus common in operating rooms.

It is my object to provide a simple, durable and efiicient machine ofthis kind adapted to prevent such spilling and tangling and to re-Wind afilm from one reel to another and completely incase said film duringsuch operation to prevent damage thereto and eliminate the dangeraccompanying present practice.

In the drawings, Figure 1 is a rear elevation of.,my improved device;Fig. 2 is a front elevation of the. same with the casing door open; Fig.3 is an enlarged horizontal central sectional view with the door closedI .and Fig. 4 is a detail sectional view illustrating the electricalswitch mechanism and the latch for the door of the casing.

In the drawings, I have used the reference numerals 10 and 11 todesignate the standards. The sheet-metal casing 12, having a door 13,pivoted on spring hinges 14 at the front thereof, is supported upon andsecured to said standards. Said hinges are placed upon the lower edge ofthe door 13 and are of the ordinary type which balance when the door-isopen. The margins at the ends and top of the door are turned inward toform flanges 13 and the edges of said flanges are turned over the rod 13to form a bead 13. These flanges overlap the end and top of the casingwhen the door is closed and form a tight joint between said door andeasing. When the door is open a suitable working table is formed therebyand the flanges 13 serve to retain loose articles and also prevent thespringing of a film from a reelsupported on said door. The. standard 101s formed with a bearing 15 .and

the standard 11, with bearings 16 and 17. The drive shaft 18 isrevolubly mounted in the bearing 15 of the standard 10, and the drivenshaft 19, in the bearing 16 of the standard 11. These shafts protrudeinto the casing 12, each being furnished with acollar 20 formed with alongitudinal perforation 21 in the rim thereof and supplied with a setscrew 22. Each shaft is adapted to receive an ordinary film reel 23 .andis provided with an 1. pin 24, one end thereof being inserted in atransverse perforation 25 in said shaft, the other end being inserted inthe longitudinal opening 21 of a collar 20. These pins are adapted to beengaged by the notch 26 common on the ordinary film reel. The inner endof each shaft is formed with an annular groove 27 adapted to receive theyielding prongs 28 of a spring clip 29 which is placed over the end ofthe shaft to retain a reel in position thereon. The outer end of thedriving shaft 18 is supplied with a drive pulley 30 rigidly securedthereto, and a second drive pulley 31 adapted to turn loosely thereon orbe secured to said shaft by the set screw 32. The outer end of thisshaft 18 is also pro ided with a stop pin 33 to prevent accidentalremoval of the drive pulley therefrom; The outer end of the driven shaft19 is threaded to receive the nut 34 and the lock nut 35 and a coiledspring 36 encircling the shaft is compressed between said lock nut 34and the washer 37 which abuts against the bearing 16. The tension ofsaid spring 36 may be adjusted and fixed-by the manipulation of the nutsthe hub 43 of said handle and rigidly connects the handle with the shaftwhen so engaged. The stop pin 44, at the end of said shaft 38, preventsaccidental removal of the handle 40 therefrom. The pulleys 30 and 31 onthe driving shaft 18 are respectively connected by the belts -15 and 46to the pulley 39 on the shaft 38 and to the pulley 47 on the motor 48,as illustrated in Fig, 1.

It is possible to normally rotate the reels only when said reels arecompletely housed. The door 13 of the casing 12 is arranged to fall intothe path of the handle 40 and thereby prevent the rotation of thedriving shaft 18. I have also provided a switch 49 for the motorcircuit, which is opened and closed by the movements of the door 13.This switch consists of a pair of terminals 50 in the switch housing 51on the casing 12. The plunger 52, of insulating material, is slidablehorizontally at one end in said casing and housing and at "its other endin the bearing 53 of said casing. The coiled spring 54 is interposedbetween the casing 12 and the pin 55 in said shank and operates tonormally disengage the contact head 56 of said plunger 52 from theterminals 50, thus opening the circuit. The end of the plunger 52 restsin the path of the door and when said door is closed, engages the same,thus causing the plunger to be moved and held in position closing theelectric circuit to the motor. The spring catch 57 on the casing 12 isadapted to engage the bead 13 of the door 13 and retain the same inclosed position.

In use, a reel containing a film is mounted on the driven shaft 19 andsecured thereto by the clip 29. An empty reel is placed on the drivingshaft 18 in a similar manner and the end of the film is secured to saidreel.

It is ordinarily desirable to operate the drivwhen the door 13 isclosed. During such operation, the handle 40 is removed from engagementwith the pin 11 and hangs loose on the shaft 38. It is sometimes,however, desirable that the operator windthe film step by step when thedoor 13 is'open in order that a damaged film may be intermittentlystopped for repair. When this is done, the plunger 52 is successivelymanipulated by the operator to connect the circuit to the motor androtate the driving reel intermittently. The device may be operatedcontinuously by the handle 40 when the door 13 is closed by unclutchingthe drive pulley 31 from the shaft 18 and moving the handle 40 to engagethe pin 41 on the shaft 38. The handle may also be employed to move thefilm slowly and intermittently for close inspection or repair when thedoor 13 is open, this movement being accomplished by successive partialturns of the shaft 38 by the handle 40, said handle being disconnectedbetween such turns.

connected with the motor and a deviceadapted to normally disconnect themotor and source of current, said device being actuated by the door,when closed, to connect said motor and source of current."

2. In a device of the class described, the combination of a casingformed with an opening at one side, a door for said opening, standardsfor said casing, reel supports in said casing revolubly mounted in saidstandards, a motor in operative connection with one of said supports forrotating the same, a source of current electrically connected with saidmotor, and a switch mounted on the casing and operated by said door uponthe opening and closing thereof to break and complete the motor circuit.

3. In a device of the class described, the combination of a casingformed with an openingat one side, a door for said opening, standardsfor said casing, reel supports in said casing revolubly mounted in saidstandards, a motor in operative connection with one of said supports forrotating the same, a.source of current electrically connected with saidmotor, a switch mounted on the casing and operated by the opening andclosing of the door to break and complete the motor circuit, andyielding means in operative connection with the other red support forretarding its rotation.

4. In a device ofthe class described, the combination of a casing formedwith an opening at one side, a door for said opening, standards for saidcasing, reel supports in said casing revolubly mounted in saidstandards, mechanism in operative connection with one of said supportsfor rotating the same by hand and by power, a source of currentelectrically connected with said motor,

a switch mounted on the casing and operated by the opening andclosing'ofthe door to break and complete the motor circuit, and adjustable meansin operative connection with the other reel support for retarding itsHARVY ARRE CUNNINGHAM.

Witnesses:

F. M. HARDY,

F. -C. CASWELL.

